It means 2 opposing ideas can be true at the same time, and when thought about together, can create a new truth and a new way of viewing the situation. There is always more than 1 way to think about a situation.
DBT:
Is an effective treatment for people who have a hard time controlling their emotions and behaviors.
Aims to replace problem behaviors with skillful behaviors.
Teaches people skills to help them experience a range of emotions without acting on those emotions.
Teaches skills to help teens navigate relationships in their environment, such as family, school, and peers.